Since you don't need privacy all the time I will suggest motorised Roman blind, position it high up under the cornice so when it's up it fits above the door, you can choose the width of the folding panels. In addition to this you can have privacy blinds attached to your door panels they could also be on remote control, it cost a bit more but it really is worth it, no cord to pull, it goes up in seconds. This system can be hard wired on your wall like a power point so you never have to replace battery. The other option is also motorised vertical blind like the one pictured here , this way you can adjust light and privacy as you like.

Scallopini is similar to Dune? The dutch gable's (triangle's) would be better in Shale Grey as would Facia and gutters. Monument gutter ok but could be a bit much. Monument to roof and garage door. Monument to window frames as well rather than black? Depends on builder window company. Scallopini to walls. That way really just 3 colours.

best decision would be to incorporate any changes for the entry with the upstairs renovation .please post photo of the new upstairs and roof and what do you plan for the front yard, fence and driveway?

Builders do this all the time so I'd have a chat with them. Build costs can vary from site to site, state to state. You may need plans for council too. Again have a chat with builder as they'll have a designer they use or chase up your own.